Quantum spin Hall insulators with arbitrary spin J support J+1/2 pairs of helical edge modes protected by mirror Chern numbers, described by a generalized Dirac fermion with higher-order dispersion and nonlinear transport.
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Adding an auxiliary nonlinear term to the quantum Rabi model extends its quantum phase transition into a continuous regime, yielding globally diverging quantum Fisher information and criticality-enhanced metrology precision in dynamics that persists with decoherence.
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Quantum higher-spin Hall insulators
Quantum spin Hall insulators with arbitrary spin J support J+1/2 pairs of helical edge modes protected by mirror Chern numbers, described by a generalized Dirac fermion with higher-order dispersion and nonlinear transport.
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Globalized critical quantum metrology in dynamics of quantum Rabi model by auxiliary nonlinear term
Adding an auxiliary nonlinear term to the quantum Rabi model extends its quantum phase transition into a continuous regime, yielding globally diverging quantum Fisher information and criticality-enhanced metrology precision in dynamics that persists with decoherence.